This guide focuses on building secure applications from the design phase onward. It introduces a “secure design blueprint” that starts with understanding environment exposure, data sensitivity, and access control requirements. It emphasizes API-first security with strong authentication (OAuth, JWT, MFA) and defense-in-depth principles. Key coding practices include strict input validation, rate limiting, safe error handling, and secure secrets management using vaults instead of hardcoding. It also highlights common vulnerabilities (e.g., XSS, SQL injection, CSRF) and how to prevent them. The main takeaway is that most security risks originate in code, so early design and coding discipline are critical.

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